Former world champion Amir Khan cautions that he won't be waiting around for a showdown with Manny Pacquiao - which the British superstar has done in the past.

After years of chasing the fight, the two boxers reached a deal to face each other in April 2017 - but weeks later the contest fell apart after the investors were unable to provide proof of funds to stage the event.

After being inactive since July 2017, Pacquiao returned to the ring earlier this month and scored a seventh round knockout of Lucas Matthysse to capture the WBA's "regular" welterweight title.

Khan was back in action in April, when he blew away Phil Lo Greco in less than a minute.

The Bolton boxer returns to the ring on Sept. 8 in Birmingham against Samuel Vargas.

Beyond Pacquiao, he hopes to secure a fight with his former training partner, Pacquiao.

At one point they trained side by side for several years - under trainer Freddie Roach.

Neither boxer is currently working with Roach. Pacquiao is now being coached by Buboy Fernandez, while Khan is handled by Joe Goossen.

“Pacquiao would be a great fight and any fighter would want to face him. But look, I’ve been chasing these fights for a long, long time and I’m so sick of chasing fights,” Khan told the Los Angeles Times.

“From a [Danny] Garcia rematch to the [Floyd] Mayweather situation — being No. 1 with the WBC and that fight not happening — to Pacquiao again … I’m just sick and tired of waiting around and hoping for a fight,” Khan said. “So now I’m just going to go with the flow … if it’s Pacquiao, it’s Pacquiao, but if it’s not, we’ll go to someone else.

“Talks of Manny Pacquiao and [England’s former welterweight champion] Kell Brook — these are fights that can make tens and tens of millions …. I’m with the right team and happy with Eddie with SkySports in the U.K. and this big platform in the U.S.